The couplet after states that Peter Pettigrew, whose Animagus form is a rat, is with the Weasleys. His cunning plot caught Sirius Black, who is a dog in Animagus form, and not a cat.

The third couplet speaks that Remus should believe that Sirius wouldn't betray the Potters, and that Sirius should have a trial, as a Grim is another word for a Padfoot, a big black dog (Sirius' form). The "truth" can be interpreted literally as well as metaphorically through Aletha Freeman, whose name means truth.

The quatrain after is about Remus and Danger, speaking of her fearlessness of his lycanthropy ("brightest dark" being the night of the full moon) and her taming abilities.

The final quatrain states that when the Pack is formed, there will be hope for the war against Voldemort.